this eaquation is supply curve Qs=P-0.4 the relationship is positive when the price increase the Qs increase....

mukhtaar

since Qs is quantity supplied
P= -0.4 + 0.2Qs
=>P +0.4=0.2Qs
=>P/0.2 + 0.4=Qs
I made Qs the subject of the formula or equation.
So your answer is correct

The

P = -0.4 + 0.2Qs is the same as
P/0.2+0.4=Qs
Price has a direct relationship with the quantity supplied i.e the higher the price the higher the quantity supplied.
that is why it is +0.4(this is the quantity and it is postive) and P/O.2(is the price and it is positive).

The

For the demand equation let me give an example 0.2P-0.4=Qd. Here the P is postive(+0.2) and the quantity which is -O.4 is negative( because of the negative sign(-) there is an inverse relationship between price and quantity. For quantity demanded the higher the price the lower the quantuty.

The

It's how I understand it

The

0.2P-0.4=Qd. the equation is wrong because the price have direct ralationship Quantity demanded but the correct equation is-0.2P -0.4=Qd
so the higher price the lower Quantity

mukhtaar

I think the relationship is inverse because of the negative sign(-)

The

ok You mean the price and quantity demanded should be negative(inverse relationship) for Qd and the price and quantity supplied should be postive(direct relationship) for Qs

The

thank you for the correction

The

yes because it got a positive gradient of +0.2

Michael

This is the mistake I found: "Since P is on the vertical axis, it is easiest if you solve each equation for P. The demand curve is then P = 8 – 0.5Qd and the demand curve is P = –0.4 + 0.2Qs. Note that the vertical intercepts are 8 and –0.4, and the slopes are –0.5 for demand and 0.2 for supply."

Valeria

dear price do not depend on quantity. rather quantity depends on price. so the equation should be Qty=0.2Px-0.4

chi-square test is used to test
A. Analysis of variance
B. Association between the qualitative variables
C. Difference between means of two distribution drawn from the same population
D. Difference between the means of two distribution drawn from different population